msp430 定时器产生SPWM波

请问一下有没有这个产生spwm的接线图呀

Susan Yang：

在https://gist.github.com/nicholasjconn/1012810 上有一个关于此的代码，请您参考一下

/*************************************************************************NJC's Simple LaunchPad DAC** Description:	This code turns the LaunchPad into a simple (slow)*function generator that outputs a sine wave at 128Hz.*For each point in a period signal, there is one*smaller PWM period. For this example there are 32*points per period. The duty cycle of each PWM period*determines the analog value at that point in time.*By continually changing the duty cycle, an analog*signal can be generated by filtering the digital*output signal. The analog filter can be as simple as*a single order low-pass filter which has a corner*frequency slightly greater than the desired signal.**This code was originally created for "NJC's MSP430*LaunchPad Blog".**See http://msp430launchpad.com for more information.***ACLK = n/a, MCLK = SMCLK = default DCO**Output Frequency = SMCLK/( # of points * PWM period)*~128Hz = (1.0MHz to 1.1MHz)/(32*256)**MSP430G2231*---------------*/|\||*| |P1.0| --> Analog Filters --> ~128Hz Sine Wave*--|RST|*||*** Author:	Nicholas J. Conn - http://msp430launchpad.com* Email:	webmaster at msp430launchpad.com* Date:	06-05-11*************************************************************************/#include <msp430g2231.h>unsigned char counter;// Current location in wave array
unsigned char wave[32] = {// Wave array, preset to values of sine128, 140, 152, 164, 173, 181, 187, 191,192, 191, 187, 181, 173, 164, 152, 140,128, 116, 104, 92, 83, 75, 69, 65,64, 65, 69, 75, 83, 92, 104, 116 };unsigned int i;// Used for 'for' loops.void main(void)
{WDTCTL = WDTPW + WDTHOLD;// Stop WDTP1DIR |= BIT0;// P1.0 outputcounter = 0;// Reset counter// Initialize TimerCCTL0 = CCIE;// CCR0 interrupt enabledCCTL1 = CCIE;// CCR1 interrupt enabledCCR0 = 256;// Set PWM period to 256 clock ticksCCR1 = wave[counter];// Set first duty cycle valueTACTL = TASSEL_2 + MC_1 + TAIE + TACLR;// SMCLK, upmode, enable interrupt, clear TA1R_BIS_SR(LPM0_bits + GIE);// Enter LPM0 w/ interrupt
}/*** TimerA0 interrupt service routine**/
#pragma vector=TIMERA0_VECTOR
__interrupt void TIMERA0_ISR(void)
{P1OUT |= BIT0;// Set P1.0CCR1 = wave[counter];// Set next duty cycle valuecounter += 1;// Add Offset to CCR0if ( counter == 32)// If counter is at the end of the array{counter = 0;// Reset counter}
}/*** TimerA1 Interrupt Vector (TAIV) handler**/
#pragma vector=TIMERA1_VECTOR
__interrupt void TIMERA1_ISR(void)
{switch( TAIV ){case2:// CCR1 interruptP1OUT &= ~BIT0;// Clear P1.0 to determine duty cycle.break;default:break;}
}

灰小子：

如果楼主用的楼上的单片机型号和程序，只需要给单片机接上vcc、gnd，还有复位电路，然后P1.0接一个 RC滤波电路就可以了。